Fire caused by substandard switch

I bought this cap in the wholesale electric market around the corner, as in moving into the new apartment in the kitchen in stainless steel finish instead of a hood a gaping big hole.
For the relatively low price of less than 100 EUR, you can not go wrong?
Conclusion:
- Very thin sheet => dented already in stock
- Permanent filter can be removed and cleaned in the dishwasher
- The whole hood but oily inside but completely in spite of the filters
=> Fire load (thick oily layer of fat) accumulates in the hood.

In addition: Exactly after the warranty (25 months) is changing the light switch of the hood into a spark generator.

Hood disassembled switch spüht sparks and tried to ignite the oil deposited layers.

=> Hood decommissioned, because I do not want to burn down the whole house block.

=> Very dangerous! (The faulty switch may at any time, even at night or in the absence of the hood pin high fire load.)

=> Warning, danger of death.

(I write normally not so much, but here it is necessary!)

My qualifications: Dipl.-Ing. Electrical.